Volume 78, Number 3, May 2007
|Number of page(s)||6|
|Published online||27 April 2007|
Sub shot-noise interferometric phase sensitivity with beryllium ions Schrödinger cat states
CNR-INFM BEC Center and Dipartimento di Fisica - Università di Trento, I-38050 Povo, Italy
Accepted: 19 March 2007
Interferometry with NOON quantum states can provide unbiased phase estimation with a sensitivity scaling as given a prior knowledge that the true phase shift lies in the interval . The protocol requires a total of particles (unequally) distributed among p independent measurements and overcomes basic difficulties present in previously proposed approaches. We demonstrate the possibility to obtain a phase sensitivity beating the classical shot-noise limit using published probabilities retrieved experimentally for the creation of Schrödinger cat quantum states containing up to beryllium ions.
PACS: 03.75.Dg – Atom and neutron interferometry / 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) / 42.50.-p – Quantum optics
© Europhysics Letters Association, 2007
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